Assighos to sullivah



Nov. 22, 192 7.

C. W. WYMAN MINING MACHINE Filed July JA- 1923 k 316E? :10 GL5 5 15%[044 azfam Patented Nov. 22, 1927.

UNITEDSTATES rarer eerie ILA; a

CHARLES W. WYMAN, F CLAREMONT. NEW E-IAMTFSI-IIBE, ASSIGNOR TO SULLLVANMACHINERY COMiANY, It CQRPQRATION {1F BLASSACHUE-EETTEi.

MINING IMACHXNE.

a lication ins-tinn 14, 1922.

My. invention relates to mining machines lit] for the electricalthereof;

An object of my invention is to provide an improved protective devicefor controller cover plates used on electric mining appara tus wherebythe unauthorized removal of the same is prevented. A still more specifieobject of my invention is to providean improved protective device forpreventing the removal of cover plates used on electric miningmachinesof the explosion proof type adapted for use in gaseous mines,whereby controlling apparatus the unauthorized removal of the same atthe mine face min a gaseous ati'nosphere is prevented and the consequentpossibiiity at an explosion caused by thearcing or sparking of theelectrical contacts igniting the mine gas is eliminated. These and otherobjects and advantages will, however, hereinafter more fully appear.

In the accompanying drawings 1 have shown for purposes ofillustrationone embodiment which my invention may assume in practice.

In these drawings:

Fig. l is a side elevation of the rear end of a mining machine embodyingmy improved device.

Fig. 2 is a detail horizontal sectional view taken substantially on line2--2 of Fig. 1.

Fig. 3 is a detail sectional view taken on line 3--3 of Fig. 2.

In this illustrative construction i have shown a mining machine of theflexible fed type including a casing or frame 1 slidable on its bottom 2on the mine bottom and adapted to be fed relative to the mine face tocut a kerf or slot therein by means of flexible feeding means not shown.The cutting and feeding mechanism may be of any approved type adapted tobe driven by a suitable motor disposed in a casing 3, herein an electricmotor, controlled by any suit-able electrical controlling mechanism, notshown, operated by a handle 4 suitably carried by the machine frame.

Formed in the machine frame is a chamber 5 in which the controllingapparatus disposed. This chamber 5 is herein provided with a closuremember or plate 6 tightly held in position by means of bolts 7. Toprevent the possibility of an unauthorized removal of the plate 6, Ihave also pro;

Serial lilo, 8511,6l8.

vided a member 8 which completely houses the closure member 6 therebypreventing access to the bolts 7. Suitably connected to the member 6herein by bolt and nut connection 9 are also members 10 which arecircularin shape and which insertable in apertures 11. in the memberS.Herein it will be noted that the members 10 are further provided withapertures 12 which are adapted to receive a rod 13 extending throughopenings in the cover member and provided with ahead 15 at one end and alocking member, herein in the form ofa lock 16, at the other endthereof.

The advantages of my improved device will be clearly evident as a resultof the description given. After-the closure member 6 has been tightlysecuredin position, the rod 1?, is inserted through the apertures 12 and14; in the members 10 and 8. rod is in position, it is locked therein bymeans of the lock 16. As a result, it will be noted that with the partsthus locked when the machine goes into the mine or into a gaseous partthereof access to the bolts 7 and subsequent removal of the plate 6 byanyone other than the properly authorized person provided with a key tothe lock 16 is prevented.

While I have in this application specifically described one form whichmy lIlVGIltion may assume in practice, it will be understood that thisform of the same is shown for purposes of illustration and that theinvention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims. v

What I claim as new and desire to secure by Letters Patent is:

1. A mining machine presenting a chamber housing electrical connections,an explosion proof cover for said chamber, attaching means for saidcover, and means for preventing unauthorized removal of said coverincluding a shroud for said attaching means and a locking rodinterlocking with said cover and'shroud.

2. A mining machine presenting a chamber housing electrical devices, anexplosion proof cover for said chamber, attaching means for said coverincluding at least one attaching element, and means for preventingunauthorized removal of said cover including a shroud for said attachingelement and After the a locking rod interlocked with said cover andshroud.

8. A mining machine presenting a chamber housing electrical connections,an explosion' prooi I cover therefor, attaching means for said cover,and means for pre Venting unauthorized removal of said cover including ashroud protecting said attaching means, apertured means carried by saidcover, said shroud having apertures to receive said apertured means, anda locking rod passing through said apertured means to obstruct removalof said shroud.

4. A mining machine presenting a chainher housing-electricalconnections, an explosion proof cover therefor, attaching means for saidcover, and means for preventing unauthorized reiroml of said coverincluding a shroud protec g said v achin-e' means, apertured mez carriedby said cover, said shroud i151 mg apertures to receive said aperturedmeans and rod receiving apertures, and a locking rod passi g throughsaid apertured means and through said rod receiving apertures.

5. A mining machine presenting a charm ber housing electrical devices,an explosion proof cover therefor, means for attaching said cover,andmeans for preventing unauthorized removal of the latter including ashroud protecting said attaching means and having openings and aperturestherein, a plurality of members carried by said cover and projectinginto the openings in said shroud, a locking rod interlocking with saidmembers and passing through the apertures in said shroud, and means forlocking said rod in position.

6, A mining machine presenting a casing having a chamber housingelectrical devices, an explosion proof coveren-gagin-g said cas ing andtightly secured thereto, and means for preventing unauthorized removalof said cover including a supplemental memberhousing said cover andengaging said Casing, said housing member having openings and aperturestherein, a plurality of members carried by said cover and projectinginto the openings in said housing member, a looking rod interlockingWith said last mentioned members and passing through the apertures insaid housing member, and means "for locking said rod in position.

in testimony whereof I affix my signature.

CHARLES W. VJYMAN.

